Protective burglary-alarm for buildings, &amp;c.



P. ROEDIR.

PROTECTIVE. BURGLARY ALARM FOR BUILDINGS, c.

APPLICATION FILED MAR. 2. I9Ia. Y

,@pg D Patented Sept. 4, 1917.

IMM'

PETER nonnen, or BROOKLYN; Nnw YORK.

Specification of Letters Patent.

Patented Sept. 4, 1917.

Application :filed March 2, 1916. Serial No. 81,570. f*

To all whom it may concern.'

Be it known that I, PETER ROEDER, a subject of the Emperor of Germany, residing in the borough of Brooklyn, county of Kings,

and State of New York, have invented new and useful Improvements in Protective Burglary-Alarms for Buildings, &c., of which the followingisy a specification.

l c My invention relatesto protective alarms intended to safeguard small stores, and especially isolated vacant residences, against burglary, and has for its objects the Vprovisions of an economical, ei'e'ctive and reliable electrically operated system vwhich is capable of serving as an e'ective substitute for the more expensive central station systems.

In devices of this character, it is essential r.- ,that they should be unailing in operation and also extremely simple, in order that any break or defect lcan be readily located and remedied. Furthermore the number of parts should be as few as possible consistent with an effective operation of the system, and it is with these objects in view that I have`de.-

vised my improved construction.

The invention is fully set .forth and described in the accompanying specification and drawings forming part thereof, in which Figure 1 is a diagrammatic view of the construction as applied to a building; and

Fig. 2 is a fragmentary detail section of a door andjamb showing the arrangement of the switch therein.

The construction illustrated in the drawings consists vessentially of a main circuit, a

secondary relay circuit, and a bell circuit. v The main circuit includes a battery 1, an

electro-magnet or rela 2, having an arma- 40 ture 3, closure means, or example a screen 4 and a door 5, a switch 6 provided with push buttons a andv b, a circuit comprised of wires 7 and`8 and a shunt comprised of wires 9 and 10 and the switch v6. As 'is' apparent from the diagram, the wires 7 and 8, communicate by means of contact shoes, 11, 11', 12, 12, with corresponding wires 7 and 8 -strung across the closure 4, for example, a window, in the `form of a screen, such closure-screen being of the well known construction. The wires 7 and 8 lead from said closure-screen to the electro-magnet 2 and Ato anotherclosure such as a door, as designated by the reference numeralv 5, only the single wire 8 being strung across this door in the form of a screen. A shunt, as represented by the wires 9 and 10 and the switch 6 is provided whereby, when the push button b is depressed while the main circuit is closed, the current will flow through the shunt and thence to the electro-magnet or relay 2. When all the closures are shut and the push button a is depressed, as illustrated, the current will How freely from the battery 1 through the circuit represented by the wires 7 and 8 across the closures 4 and 5 and through the coils of the electro-magnet, thereby energizin the core and attracting the armature '3. hould the door 5 be open, or should thewires 7 and 8 covering the closure 4 be short-circuited by a tool, such as a chisel or saw coming in contact therewith, the flow of the current through the electromagnet vwill cease and the armature will, in response to the spring o, move against the contact d into the dotted-line position indicated. This will e'ect the closing of a relay circuit whichis comprised of a cell or battery 13, wire 14, lock switch 17, and lockbolt 22, a second switch 18 and an electro- Pmagnet and return wire 15.

As is apparent, when the armature 3 of the electro-magnet 2 engages the contact d, the current in' the relay circuit will flow through the-wire 14, across the switch 17, through the contact point d, along the armature 3, back through the wire 15, across the vswitch 18,.through the coils of the electromagnet 21, and thence to the battery through the wire 15, thereby energizing the electro-magnet 21 and causing the armature contact-arm 20 to move into engagement with the spring fingers 'of the switch 19, whereby the bell circuit is closed. When the bell circuit is closed, the current will iow from the one plate of the battery 13 alon the wires 14 and 14', through the bell 16, a ong wire 15', across the switch v 19, which latter is closed `by the armature contact-arm 20- (as indicated-'by the dotted lines), and thence along the wires 15 and 15 to the'opposite plate of the battery. In order to cut 0E the alarm, and prevent the same ringing, it is merely necessary for-a person having the proper key to depress the lock-'bolt 22 which causes the barbed nger 23 to engage the armature contact-arm 20 and moves it into engagement with the spring fingers of the switch 18. This breaks the circuit through the bell at the switch 19 110 and resets the relay circuit in condition for operation by the breaking of the main circuit.I

In practice it is customary during the day time when the door 5 is open, for the proprietor, orother person having charge of the premises, to depress the push button a, so that the main circuit will be broken while the door is open and the premises occupied. At the same timey the vlock-bolt is depressed out of contact with the spring lingers of the switch 17, and since the armaturevcontactarm 20 will then be depressed into contact with the spring lingers of the switch 18, both the relay and the alarm circuits will also be dead. When, however, the building is closed for the night, the lock-bolt 22 is `first projected into the position shown in the drawing so' as to connect the spring lingers of the switch 17, but without moving the armature contact-arm 20 out of contact with the springngers of the switch 18. Then the push button b is depressed and thereby the pushv button a is projected beyond the j amb sov that when the door is closed it will be forcibly depressed and the push button b will again bev projected and will enter a recess formed in the door. -As a consequence, the current will be switched from the shunt wires 9 and 10 through the .wire 8, and thereafter any movement of the door will break the main circuit rendering active,

1 through the relay, the bell circuit and oper- Vating the alarm.

In many cases the alarm bell is placed on the exterior wall of the "bfuilding in an ob- `yet infallible and durable protective system `and is of great value for isolated residences, small stores, stations, and the like. All of the wiring of the closure means is referably bare wire sothat the same will e immediately short circuited by mere light contact rbetween two adjacent wires due to a tool or other metal implementdisplacing a wire so as to force it into contact with another adjacent wire of opposite polarity.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A protective bur lar alarm system l comprising a main circuit including closurewhereby said button is de ressed into alineythe closure means when shut, then the urmeans provided with a screen-likeconductor thereon so disposed that the movement thereof when the said circuit is closed effects a break therein, va shunt .circuit in proximity Lto said closure means, a switch adapted to divert the lcurrent from said j Asame during the closing thereof and the p movementof said switch thereby effecting av diversionof the current through a screenlike conductor on said closure-means, a relay-circuit including a battery, conductors connectingv the same with a second electromagnet, and an alarm circuit, including anv alarm, adapted to be closed by the movement of the armature ofthe 'electro-magnet in said relay circuit.

2. In a device of the character described, the combination comprising a main circuit including closure-means provided with a screen-like conductor thereon so disposed that the movement thereof when the circuit is closed effects a break therein, a shunt circuit in proximity to said closure-means, va push button switchl including two buttons adapted to alternately project from a sup- 9'0 porting surface, one only of said buttons being adapted when projecting from said surface to contact with said closure-means prior to the complete closing of said means,

ment with said surface, said switch being so position, the current will vpass through 4a conductor on said Aclosure-meansprovided with a screen-like conductor thereon and when said closure means is open and the switch is turned so as to efect the projec` l tion of thebufton previously depressed by rent will iow through said shunt, avrelay circuit adapted to beenergized bythe breaking of said main circuit, vand an alarm cir# cuit including an alarm adapted to be energized when said relay circuit is energized.

Signed at New York, county and State of jll-n- New York, this 4th day of February, -191.6. 4

PETER RVOEDER. 

